Propeller ventilating means



Jan. 31', 1928. 1,657,496

F. CHARAVAY PROPELLER VENTILATING MEANS Filed March 27, 1926 119 VENTOR/ u I 314; ATTORNEY Patented Jan. 31,1928.

UNITED STATES PATENT OFFICE.

FREDERICK GHARAVAY, OF PIQUA, OHIO, ASSIGNOR OF ONE-HALF T GEORGE. W.

HARTZELL, OF IPIQUA, OHIO.

PROPELLER VENTILATIN G MEANS.

Application filed March 27, 1926. Serial No. 98,045. I

This invention relates to new and useful of an electric motor 6, although it maybe improvements in propeller ventilating means. It is one of the principal objects of my invention to provide for rooms, halls and 5 auditoriums a propeller fan which will not only improve the ventilation of them, but which, being of aerofoil section, will run with less current cost and greater efiiciency than the ordinary electric fan.

It is another object of my invention to provide in. front of the propeller, an air discharge opening of less diameter than the propeller so that the air forced through the opening by the propeller will not return to destroy the vacuum behind it.

My propeller and restricted air-discharge means in front of item admirably adapted for use in pulling warm air through a kiln for drying lumber or other material, since the restrictedair-dischargeopening will not permit the air to return through 1t for entrance behind the propeller to destroy the vacuum which enables the propeller to pull or exhaust the air from the kiln drying room. V

' Other important and incidental objects will be brought out in the following specification, and particularly set forth in the subjoined claim.

In the accompanying drawings illustrating my invention, Figure 1 .is a side view of my propeller fan, with the enclosing casing in section, showing the air-discharge opening of less diameter than the propeller in front of the latter. Figure 2 is a partial front view of the same. And Figure 3 is. ahorizontal, sectional view taken through a drying-kiln room, showing how my propeller pulls the warm, dry air therethrough. Referring to the accompanying drawings for a detailed description of In invention, the numeral 1 designates a cylin rical casing having a square base portion 2. This casing 1, which may be of any suitable form, is itself, or through an intermediate passage (not shown), in communication with a room, hall or auditorium for the purpose of exhausting air therefrom.

Formed in 'the front wall of the casing 1 is a circular air-discharge opening 3. Immediately behind this opening 3, and of greater diameter than the latter, is a propeller 4 having an aerofoil section. This pro- "peller is fixedly secured to the armature shaft operated from the latter or other prime mover through intermediate means (not shown). In the present instance the motor 6 is mounted on two I'beams 7, 7 that are supported by end piers 8, 8. While I have shown these means of solidly mounting," the propeller so as not to interfere with the flow of air to it, any other suitable means may be employed for; this purpose if desired.

The propeller 4 rotates in a circular 0 ening of slightly greater diameter forme in a partition 9. Between the latter and the front wall of the casing 1, axially inclined braces 10 are secured. (See Figure 1.)

When rotated by the motor 6, the propeller 4 will run at low current cost to discharge'air through the restricted orifice 3 in a full continuous and eas flowing stream. The orifice 3, being of less iameter than the propeller, will prevent the air from returning through it for entrance behind the propeller to destroy the vacuum and thereby to lessen the pull which the propeller exerts upon the air at its rear. Consequently,

assisted b an unimpaired vacuum behind it,

and aide by its own peculiar construction, my propeller will continuously, efficiently and with great force withdraw air from a room, hall or auditorium.

In Fi re 3 I have shown my propeller 4 placed 1n the front part of a kiln-drying room 11, and immediately behind an airdischarge opening'12 of less diameter than the propeller formed in the front wall of the room. When the propeller 4 is rotated by the motor 6, which has a mounting similar to that shown in Figure 1, warm, dry air will be drawn from a drying chamber 13 through a pipe or passage 14 into the rear end 0 the room 11, and through it, as indicated by the arrows in Figure 3. Lumber or other material placed in this room will be thoroughly dried by the full,;continuous and uninterrupted stream of; warm air pulled over it by the propeller 4, since the orifice 12 in front of it, being of less diameter', will not permit any ,air to return for entrance behind the propeller, thereby to destroy the vacuum and lessen the pull exerted by the ropeller upon thedrying air. I do not wis to' be limited to the details of construction and arrangement herein,

shown and described, and any changes or a fan of larger diameter than the opening 10 modifications may be made therein within in said enclosure, said fan being mounted the scope of the subjoined claim. for rotation in said partition hole and hav- Having described my invention, I claim: ing a diameter slightly less than said hole An enclosure to be ventilated having an to prevent back draft.

air discharge opening, a partition in said In witness whereof I have hereunto set my enclosure behind said opening and havincgl hand this 24th day of March, 1926.

a circular hole larger than said opening an through which air can only pass to it, and FREDERICK GHARAVAY. 

